**1** A projectile is fired from a gun
near the surface of Earth. The initial velocity
of the projectile has a vertical component of 98 meters per second
and a
horizontal component of 49 meters per second. How long will it
take the
projectile to reach the highest point in its path?

(1) 5.0 s (3) 20. s

(2) 10. s (4) 100. s

1
2
3
4

**2** A 70.-kilogram astronaut has a
weight of 560 newtons on the surface of
planet Alpha. What is the acceleration due to gravity on planet
Alpha?

(1) 0.0 m/s^{2}
(3) 9.8 m/s^{2}

(2) 8.0 m/s^{2} (4) 80. m/s^{2}

1
2
3
4

Base your answers to questions
3 and
4 on the diagram and information below.

The diagram shows a student seated on a rotating circular
platform, holding a
2.0-kilogram block with a spring scale. The block is 1.2 meters
from the center
of the platform. The block has a constant speed of 8.0 meters per
second.
[Frictional forces on the block are negligible.]

**
**

**3
**Which statement best describes the
block’s movement as the platform
rotates?

(1) Its velocity is directed tangent
to the circular path, with an inward

acceleration.

(2) Its velocity is directed tangent to the circular path, with an

outward acceleration.

(3) Its velocity is directed perpendicular to the circular path,
with an
inward acceleration.

(4) Its velocity is directed perpendicular to the circular path,
with an
outward acceleration.

1
2
3
4